Receiving Error Code 306

[Rookdroid]

How To Collect SteamVR System Information:

1. Click the 'SteamVR beta' menu in the upper left of the SteamVR Status window
2. Click 'Create System Report'
3. Click 'Copy to Clipboard'
4. Browse to https://gist.github.com/
5. Click in the text entry box (by the 1)
6. Paste clipboard contents
7. Click 'Create Public Gist'
8. Add URL of your new Gist below

Your system information

• Steam client version (build number or date): Built September 9, 2018
• Distribution (e.g. Ubuntu): Ubuntu 16.04
• Graphics driver version (run nvidia-settings): 396.54
• Gist for SteamVR System Information: https://gist.github.com/Rookdroid/643c5b889a8bb7d1863f4c97adcc469d
• Opted into Steam client beta?: Yes
• Opted into SteamVR beta?: Yes
• Have you checked for system updates?: Yes

Please describe your issue in as much detail as possible:

Describe what you expected should happen and what did happen. Please link any large code pastes as a Github Gist

When trying to run SteamVR I receive the 306 error "SteamVR failed to initialise for unknown reasons. (Error:Shared IPC Compositor Connect Failed (306))". My headset also only displays on the right eye showing my ubuntu desktop.

Steps for reproducing this issue:

1. Plugin headset
2. Run steam from terminal
3. Run SteamVR from steam GUI

[anon2828226]

Same error on SteamVR startup in Ubuntu 18.04 LTS, AMD R9 390 with Mesa 18.05, all up to date, though I think this SteamVR failure may be related to my Vulkan not working. When I run vulkaninfo I get: Vulkan Instance Version: 1.1.70

/build/vulkan-Kbdbga/vulkan-1.1.70+dfsg1/demos/vulkaninfo.c:2700: failed with VK_ERROR_INITIALIZATION_FAILED

@Rookdroid try running vulkaninfo. I am not confident at all that this is a related issue but I thought It was weird that my Vulkan install is failed and so is SteamVR.

Forgot the turn on lighthouse when making my system report. If that is needed I could. SteamVR-2018-09-25-PM_03_41_20.txt

[lboklin]

I have the same problem as @jackleson

$ vulkaninfo
===========
VULKAN INFO
===========

Vulkan Instance Version: 1.1.70

ERROR: [Loader Message] Code 0 : /usr/lib/i386-linux-gnu/libvulkan_intel.so: wrong ELF class: ELFCLASS32
ERROR: [Loader Message] Code 0 : /usr/lib/i386-linux-gnu/libvulkan_radeon.so: wrong ELF class: ELFCLASS32
/build/vulkan-Kbdbga/vulkan-1.1.70+dfsg1/demos/vulkaninfo.c:2700: failed with VK_ERROR_INITIALIZATION_FAILED

I had to explicitly install vulkat-utils 1.1.70 with sudo apt install vulkan-utils=1.1.70+dfsg1-1 because it would otherwise choose 1.1.82.0+dfsg1-0ubuntu0.18.04.1\~gpu1 from the graphics-drivers repo which has broken dependencies:

The following packages have unmet dependencies:                                                                                                                                                                     
 vulkan-utils : Depends: vulkan-tools but it is not going to be installed                                                                                                                                           
E: Unable to correct problems, you have held broken packages.

even if I install the matching version of vulkan-tools explicitly beforehand.

Edit: I had a bunch of package weirdness which I think I managed to sort out. I installed nvidia-415 (I had nvidia-410 installed but nvidia-settings showed 415.18 which threw me off) and dist-upgraded. vulkaninfo now gives proper output and SteamVR launches without error. However, the HMD now doesn't turn on and I see what's supposed to be rendered to it in a desktop window instead.

Edit 2: Getting the HMD to turn on was as simple as replugging the HDMI cable. So now it works again.